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错觉：挤出一块小空间
Author:
靳道阳
GeoGebra
New Resources
拼砌四邊形
画直线等分三角形的面积
四邊形的特性
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
Discover Resources
Ray tracing
Field function 展示
三角函數
多項式
时钟（序列文本）
Discover Topics
Linear Programming or Linear Optimization
Trigonometric Functions
Diagrams
Square
Tangent Function